Differential gearing.



DE WITT G. GOOKINGHAM & J. H. HERTNBR.

DIFFERENTIAL GEARING.

APPLICATION FILED 00m. 20, 1910.

1,029,793.- Patented June 18, 1912.

COLUMBIA PLANOGRAPN co., WASHINGTON. D. c.

srnrpsgi grunr OFFICE.

DE WITT G. COOKINGI-IAM AND JOHN ,H. HERTNER, OF CLEVELAND, OHIO, ASSIGNORS TO vTHE RAUCI-I AND LANG CARRIAGE COMPANY, OF CLEVELAND, OHIO, A CORPO- BATION OF OHIO.

DIFFERENTIAL GEARING.

Specification of Letters Patent.

Patented June 18, 1912.

Application filed October 20, 1910. Serial No. 588,035.

of which the following is a specification,

the principle of the invention being herein explained and the best mode in which we have contemplated applying that principle, so as to distinguish it from other inventions.

The present improvements have regard more particularly to that type of differential gearing wherein two beveled gears are employed with one or more beveled pinions, carried by the gear housing or other fixed support, meshing therewith, so as to trans mit power from the one of said gears that happens to be the driven member while still permitting a differential rotation of the other. In the designing of gears of this class it is customary to use more than one such beveled pinion because additional pinions add to the strength and also because of the better balancing of strains thereby secured. This last condition, viz. of mechanical balance is, of course, only realized when the pinions are equally spaced and while the number of pinions has varied, the present practice is to use four disposed 90 degrees apart. These pinions, whatever their number, are generally mounted on the arms of a spider, but in the manufacture of such spider it has been found diflicult to machine, harden and grind the same within the limits of accuracy necessary for first class work, largely on account of the warp ing and distortion that occurs during hardening. In the case of the four-arm spider required for use in the standard form of gearing just referred to, the four centers of the ends of the arms will spring so out of plane and out of angle that the grinding operation, even if possible, becomes very expensive and troublesome owing to the amount thereof necessary.

The object of the present invention is to provide an improved construction of such a fours-rm spider whereby this trouble may be overcome and to this end said improvement'consists of the means hereinafter fully described and particularly pointed out in the claims.

The annexed drawing and the following description set forth in detail certain mechanism embodying the invention, such disclosed means constituting, however, but one of various mechanical forms in which the principle of the invention may be used.

In said annexed drawing:-Figure l is a horizontal sectional View of a differential gearing embodying our present improved spider for carrying the beveled pinions; while Figs. 2 and 3 illustrate in plan and side elevation respectively one of the parts entering into the construction ofsuch a spider.

The differential gearing includes the driving gear 1 fixed on the shaft 2; the gear 3 fixed in housing 4; the pinions 5 carried on a four-arm spider fixedly secured to a casing 12 carried by gear 3; and the gears 6 fixed to the two separate parts 7 of the driving axle. It is to the'constructio-n of the spider which carries the pinions 5 that the present invention specifically relates.

A spider having two oppositely disposed arms, that is, having its arms spaced 180 degrees apart, can of course be ground and the balance of the piece finished without the difficulty just referred to above in grinding and finishing a four-arm spider. We, accordingly, propose to construct the four-arm spider of two duplicate sections 8, so shaped that they can be interlocked to make substantially a four-arm spider. Such sections 8 are complementary to each other, the central hub 9 of each being recessed, as at 10, on one side so as to allow the sections to interlock when placed with their arms 90 degrees apart. It will be understood that not only are such sections made complementary but also identical so that no difiiculty is encountered in pairing them. The manner in which these sections are incorporated in the complete structure should clearly appear from a reference to Fig. 1 where it will be seen that their hubs 9 slip over a central bushing 11, while the ends of the arms are held in the casing 12 of the gear just as in the case of the integral four-arm spider.

From the foregoing construction it will follow that the'two-arm sections can be machined and finished up with the same ease and facility that the two-arm spider has heretofore been manufactured; while the assembling of the sections into a complete four-arm, spider is effected Without any in.- convenience whatever and the result is a structure perfectly balanced and true.

Other modes of applying the principle of our invention may be employed instead of the one explained, change being made as regards the mechanism herein disclosed, provided the means stated by any of the following claims or the equivalent of such stated means be employed. I

We therefore particularly point out and distinctly claim as our invention 1. In a diiferential gearing, the combination with its gears, of a spider provided with a plurality of pairs of arms, said spider comprising complementary two-arm sections, and pinions mounted on said arms and meshing with said gears.

2. In a difierential gearing, the combina tion with its gears, of a spider provided 'with four arms equally spaced from each other, said spider comprising two complementary two-arm sections, and pinions mounted on said arms and meshing with said gears.

3. In a difierential gearing, the combination with its gears, of a spider provided with four arms equally spaced from each other,

. said spider comprising two complementary sections each formed with two diametrically opposite arms, and pinions mounted on said arms and meshing with said gears.

4. In a difierential gearing, the combination with its gears, of a spider provided with four arms equally spaced from each other, said spider comprising two complementary sections,.each section being formedwith two diametrically opposite arms, and with a recess on one face of its hub, the hub of one section fitting into the recess of the other section, and pinions mounted on said arms and meshing with said gears.

5. A spider section for a differential gearing of they class described, said section comprising a hub and two oppositely-extending pinion-receiving arms borne by said hub, the latter being formed to interlock with another similar complementary section with the arms of one section in angular relation to those of the other.

6. A spider-section for a difi'erential gearing of the class described, said section comprising a hub and two oppositelyextending pinion-receiving arms borne by said hub, the latter being formed to interlock with another similar section with the arms of one section at right-angles to those of the other.

7. A spider-section for a difierential gearing of the class described, said section comprising a hub and ,two oppositely extending pinion-receiving arms borne by said hub, thelatter being recessed on one side so as to interlock with the corresponding side of another similar. section with the arms of one section at right-angles to those of the other.

Signed by us, this 17th'day of October,

DE VVITT O. OOOKINGHAM. JOHN H. HERTNER. Attested by- ANNA L. GILL, J NO. F. OBERLIN.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents, Washington, D. C. 

